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Volume 29 (2004)
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Volume 29, Issue 95
Displaying 1-20 of 20 articles from this issue
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Article type: Cover
2004 Volume 29 Issue 95 Pages Cover1-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Cover
2004 Volume 29 Issue 95 Pages Cover2-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Appendix
2004 Volume 29 Issue 95 Pages App1-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Index
2004 Volume 29 Issue 95 Pages Toc1-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Appendix
2004 Volume 29 Issue 95 Pages App2-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Appendix
2004 Volume 29 Issue 95 Pages App3-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Saburo MURAKAWA, Nobuyoshi KIYOTA, Nobuo NISHITSUGU, Shintaro KAKIMOTO ...Article type: Article
2004 Volume 29 Issue 95 Pages 1-13
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSThe purpose of this study is to accumulate the basic data for planning of the ventilation and air conditioning facilities in the electrification commercial kitchens. In this paper, as the first report through the study, the authors clarify the characteristics of the heat loads generated by the cooking facilities placed at the chamber that was made in the experimental cooking room. After the confirmation on the performance of air tightness, heat loss, etc. in the testing room to be applied for the study, we carried out the simulated cooking experiments such as boiling up water in the facilities. On the basis of the experimental results, we defined the three cooking zones, according to the heat loads generated at each hot water temperature zone. And, the electric cooking facilities were classified in three groups based on the patterns of the heat loads generated. In each cooking zone of the facilities, we showed sensible heat loads, latent heat loads and total heat loads per rated capacity of the facility. Also, we carried out the practical cooking experiments using the ingredients, and clarified the relationship of the heat loads generated between the simulated cooking experiments and the practical cooking experiments.View full abstractDownload PDF (1757K) -
Toshio Nakata, Tsutomu Hosokawa, Hiroshige Kumamaru, Katsuhiko HojoArticle type: Article
2004 Volume 29 Issue 95 Pages 15-23
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSIt is hoped that an effective heat exchanger in the dropwise condensation is developed for the saving of resource. However, the heat transfer characteristic is influenced by many factors, and the relations have not been clarified yet. In this research, the drop diameter, the cleaning frequency of falling drops on the rough plate and the dropwise condensation heat transfer characteristic under steam pulse jets has been experimentally investigated. As a result, it was obtained that empirical formulas concerning the vapour flow rate, the diameter, the cleaning frequency of falling drops, and the dropwise condensation heat transfer in each jet condition had been obtained for each rough heating surface. Moreover, it was became clear the effect of cleaning frequency and diameter of falling drops on the heat transfer.View full abstractDownload PDF (905K) -
Taro Mori, Masamichi Enai, Satoshi Aida, Mitsugu Saito, Hirofumi Hayam ...Article type: Article
2004 Volume 29 Issue 95 Pages 25-33
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSIt is possible to design the thermal and humid indoor climate by using condensation phenomena on water ponds in a large well, if the relationship between the condensation rates and the boundary condition, i.e. air velocity, vapor pressure and adiabatic saturated temperature, was found from actual-sized experiments. In this report, such relationship was reinvestigated by using the reported experimental results. Conclusions were discussed as follows: 1) It is very difficult to measure surface temperature of water ponds when we used thermocouples. The reason is that there are many small waves on the water ponds. So simple calculation method for surface temperature of water ponds was proposed. When the proposed method can evaluate the surface temperature of water ponds by using water temperature and adiabatic saturated temperature. 2) Ratio of interior division was found from measurement results. This ratio coincided with the result from thermal conductance of saturated air film and of water film under the water surface. 3) When the ratio of interior division was used for estimating the water surface temperature, difference between vapor pressure of room air and of water surface can be easily obtained. That difference of vapor pressure can be used as the first approximation factor. And also each approximated function between vapor pressure and condensation (evaporation) rates was a straight line that coincides with the origin.View full abstractDownload PDF (1174K) -
Yukimasa Ogawa, Tatsuki Hara, Masanori Fujita, Yoshiteru NakagawaArticle type: Article
2004 Volume 29 Issue 95 Pages 35-43
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSThis paper reports the actual operation data of Yagi Bio Ecology Center which is received manure, tofu residue and so on and these waster are digested by methane fermentation. Based on the results of operation of the Center, we evaluate the biogas plant as the energy supply plant in Japan. The performance of the co-generation system is that the electrical efficiency of gas engine generators is 28.1%, the heat recovery efficiency is 43.2%, and total efficiency is 71.3%, the heat utilization efficiency is 18.8% and the total utilization efficiency is 46.9%. 95.6% of the generated electricity is used in the biogas plant. If the quantity of tofu residue would increase more 5t/d, the ratio of supplying electricity to outside among the generated electricity in the plant will increase to 24.9%. Further if the digested liquid would be used as liquid fertilizer, the ratio of them will increase to 76.4%. We calculated excess electricity and heat based on the Center's actual data, that if the biogas plants are received 40% of manure, food processing waste and kitchen garbage which are produced in all Japan, these plants will supply electricity about 110,000kW to out side of plants. If these plants would use digested liquid as liquid fertilizer directly, these plants will supply about 300,000kW to out side of plants.View full abstractDownload PDF (1443K) -
Toshiaki Omori, Jeonghoon Yang, Shinsuke Kato, Shuzo MurakamiArticle type: Article
2004 Volume 29 Issue 95 Pages 45-52
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSThis study aims to develop the high-accuracy analysis method of radiative heat transfer that can be used for the coupled simulation of convection and radiation. In this paper, calculated results are compared with those measured using a thermal manikin to quantitatively evaluate the validity of the method. The thermal manikin consists of 16 independently controlled parts for skin temperature and heat release and is situated in the center of an experimental room. Air is supplied from a porous floor carpet and flows out of the ceiling. Upward air stream seems to be uniform and of very small velocity. The thermal manikin is controlled under a thermally neutral mode. Skin temperature and heat release distributions of the thermal manikin are measured. Thermal environment around a human body model resembling the thermal manikin in shape and size is simulated by a coupled analysis of convection and radiation. CFD (Computational Fluid Dynamics) analyses are performed based on a low-Reynolds-number-type k-ε turbulence model. Simulated results are in good agreement with measured ones. Parametric studies are also carried out for investigating the influence of inflow velocity and emissivity of human body model on calculated results.View full abstractDownload PDF (1234K) -
Mine Sudo, Shuzo Murakami, Shinsuke Kato, Doosam Song, Tomoyuki Chikam ...Article type: Article
2004 Volume 29 Issue 95 Pages 53-61
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSThermal environment in the recent office has changed greatly because of the change of working style which has been brought by the development of OA equipments. On the other hand, large individual differences in preference to thermal environment exist among the occupants of an office room. Therefore the mixing-type air-conditioning system that aims to establish a uniform environment within the occupied zone of a room is not able to provide each occupant with fully accepted thermal comfort. The personal air-conditioning system is a method that can provide occupants with the controllability of a local supply of air, so as to adjust their individual thermal environment. Thus, this system has possibility of realizing both the improvements of occupants' thermal comfort and energy conservation. However, conventional personal air-conditioning system has not been accepted in the Japanese office, because it has various shortcomings. The purpose of the study is to develop personal air-conditioning system obtaining thermal comfort and energy conservation. In this paper, the drawbacks about the conventional personal air-conditioning system are examined by hearing to the designer of air-conditioning systems and the subjective experiment. As the result, it is found that subjects feel discomfort by dry eyes and breathing with difficulty, although subjects feel thermal comfort by the personal air-conditioning system. Moreover, energy is often wasted because of neglecting the personal control.View full abstractDownload PDF (1188K) -
Shigeo HONDA, Yoshitaka KITA, Kazutomo ISONO, Yoshiaki KASHIWASE, Kaor ...Article type: Article
2004 Volume 29 Issue 95 Pages 63-71
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSTo clarify the possibility of cross contamination by the door opening and closing operation in a cleanroom at solid tablet manufacturing factories, the dynamic characteristics of the door opening and closing operation is measured with airflow visualization and 3-dimensional ultrasonic anemometer. A strong backflow is observed in the opening operation using an inside opening single swing door and in the closing operation using an outside opening single swing door. However, the backflow is not observed when using a single sliding door. Moreover, the backflow velocity when opening and closing the door did not depend on the initial differential pressure between rooms. The mass transfer of airborne particles by the door opening and closing operation increases in order of the single sliding door<the inside opening single swing door<the outside opening single swing door. The results clarify the possibility of cross contamination by the door opening and closing operation in a cleanroom.View full abstractDownload PDF (1081K) -
Taeyeon Kim, Shinsuke Kato, Shuzo Murakami, Byung-Seon KimArticle type: Article
2004 Volume 29 Issue 95 Pages 73-80
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSThe locations of pollutant sources in a room have a great responsibility for pollutant distribution in the air. The concentration of the point concerned depends on the each pollutant source and the room air distribution. The concentration of that point can be considered as the sum of the contribution ratios of sources. To controlling and designing the indoor air quality efficiently, it is very important to know the contribution ratio of pollutant sources in a room. In this paper, the new scales of indoor air quality for assessing the contribution of pollutant sources, termed Contribution Ratio of Indoor Air Qualities (CRIAQs), were developed. These scales are all calculated using the CFD (Computational Fluid Dynamics) method, which accurately analyzes the velocity, temperature, and pollution distribution. Using the CRIAQs, the contribution ratio of pollutant sources of the model room was analyzed. The CRIAQs were found to be very useful in this study.View full abstractDownload PDF (999K) -
Hiroyuki TODA, Etsuro ARIKAWA, Kaori SAKO, Yuki YAGOME, Akiko ANDOArticle type: Article
2004 Volume 29 Issue 95 Pages 81-88
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSFormaldehyde concentrations in the air of anatomy practicing room located in the medical department of four universities, respectively were measured in the anatomy training periods. As a result of the measurements, formaldehyde concentrations in all anatomy practing rooms air decreased with the lapse of the anatomy training periods. Through the body anatomy treatment process were different in each university, the maximum formaldehyde concentrations were 0.45〜1.5ppm. In the end of practical training periods, the concentrations decreased to 0.12〜0.24ppm. The formaldehyde concentrations near the body also showed the decrease, and this tendency was equal to the changes of formaldehyde concentrations in the anatomy practcing room air. The maximum formaldehyde concentrations from the bodies were 2.2〜2.5ppm. From the supply air quanitities and the maximum formaldehyde concentrations in each anatomy practing room air, the maximum formaldehyde concentrations generated from the bodies were tried to calculate. As the result, the maximum generation rate of hormaldehyde from the body was 3.7×10^2〜1.3×10^3mg/hr per one body.View full abstractDownload PDF (943K) -
Ryuichiro GOTO, Yasuhiro HAMADA, Makoto NAKAMURA, Hideki KUBOTA, Kiyos ...Article type: Article
2004 Volume 29 Issue 95 Pages 89-98
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSThis paper constitutes Part 2 in the series of studies on hybrid utilization of renewable energy and the fuel cell for a residential energy system. First, three kinds of experiments applied typical electric power and hot water demands were carried out. The primary energy reduction rate of the double DSS operation to a conventional system reached 24%. Second, the amount of the primary energy reduction in Sapporo in winter surpassed the experimental results for the standard energy demands. Therefore, it was clarified that this system has a high degree of feasibility in the cold region. As a result of simulations on the grid-connected fuel cell cogeneration system without the reverse power flow, the optimum capacity of the fuel cell was 0.9kW at the double DSS operation for the typical energy demands. It is possible to miniaturize the fuel cell capacity, when the reverse power flow is accepted.View full abstractDownload PDF (1303K) -
Article type: Bibliography
2004 Volume 29 Issue 95 Pages 99-122
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Appendix
2004 Volume 29 Issue 95 Pages App4-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
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Article type: Appendix
2004 Volume 29 Issue 95 Pages App5-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSDownload PDF (123K) -
Article type: Cover
2004 Volume 29 Issue 95 Pages Cover3-
Published: October 25, 2004
Released on J-STAGE: September 05, 2017
JOURNAL FREE ACCESSDownload PDF (130K)
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